You may have inherited the problem from the previous owner.
Most drain plugs are 20 mm long.
The exact spec is M12 x 1.5 x 18 mm
M12 = diameter of bolt is 12 mm
1.5 = the distance between 2 adjacent threads is 1.5 mm
18 mm is the length of the threaded portion (not incl. the head).
Anyway, I use:
1. Woodramps (3 layers)
2. The Oil Filter Cap: tighten until it stops and tug with 2 fingers and that is it. Personally I think 25 Nm is too much for this plastic cap.
When I have time I will write a DIY with the Title: "changing oil made ridiculously simple!".
PS: BTW, buy 2 drain plugs from dealer (keep one in the glove box as spare!).
Last edited by cn90; 05-27-2010 at 08:50 AM.